CPAP Mask Sizing Guide: How to Get the Perfect Fit

To get the most out of your CPAP mask, it is vital that you have a well-fitting one. Instructions on fitting are in your sleep clinician's user guide

To get the most out of your CPAP mask, it is vital that you have a well-fitting one. Instructions on fitting are in your sleep clinician's user guide and we hope to answer some frequently asked questions below!

Your sleep physician or medical equipment provider should have helped you to fit your mask properly when you started treatment. Please note that the instruction manual also contains complete fitting instructions. Factors will affect your fit such as:.

  • CPAP Mask Position. The fit of a mask depends on your position: it might not work as well when you’re lying down, because our facial muscles change-they relax even more than they do normally while we sleep. It's always best to fit the mask in your usual sleeping position, whether you're in bed with no pillows or if you are using a recliner.
  • CPAP Mask Size. If you're finding it difficult to get a good seal by tightening your mask too much, then you may need the wrong size of mask. Please note that sizing across different masks is not always the same. Talk to your equipment supplier or sleep specialist if they can do anything for you!
  • CPAP Mask Headgear. A mask should be loose enough to create a seal, but not so tight that it is uncomfortable. If you feel like your strap is too loose or too tight, try adjusting the headgear or replacing the old gear with new one if needed.
  • MicroFit™ Dial.When you use a ResMed mask with the MicroFit™ Dial, your clinician will set it at the optimal position. Making changes to this fit might make things uncomfortable or less effective.

Fit Packs - All Sizes Included

For the first time user of a CPAP mask, we recommend purchasing one that comes in different sizes. These are called Fit Packs and usually come with all the sizes included so you can try them on until you find which size is appropriate for your needs.

CPAP Mask Size Guides

For some of our most popular masks, we have provided fitting guidelines below. If you experience difficulties in fitting your mask, please refer to the user guide or ask your care provider for assistance.

If your mask is properly fitted but still feels uncomfortable, it might be time for a different type of mask. Rapid CPAP offers full face masks and nasal pillows; you’ll find that certain models may suit you better than others. 


Resmed Airfit F20 Full Face CPAP Mask

Resmed Airfit N20 Nasal CPAP Mask

Resmed Airfit N30 Nasal CPAP Mask

Resmed Airfit F30i Full Face Mask

Resmed Airfit F30 Full Face Mask


Fisher & Paykel Simplus Full Face CPAP Mask

Fisher & Paykel Vitera Full Face CPAP Mask 

Fisher & Paykel Eson 2 Nasal CPAP Mask

Philips Respironics

Philips Respironics ComfortGel Nasal CPAP Mask

Philips Respironics Amara Gel Full Face CPAP Mask

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